Quiz on Water Scarcity

Question 1

A scientist notices that a river that once supplied water to a farming community has shrunk significantly over 20 years. Which combination of factors BEST explains why this river is experiencing water scarcity?

Accepted Answer

Reduced snowpack in mountains due to warming temperatures and increased water use by a growing population

Question 2

Look at the following data about two regions: Region A receives 50 inches of rain per year and has a population of 10,000 people. Region B receives 15 inches of rain per year and has a population of 2,000 people. Which conclusion is BEST supported by this data?

Accepted Answer

You cannot determine water scarcity risk without also knowing how much water each region uses and how water is stored

Question 3

A city draws most of its drinking water from an underground aquifer. For the past 10 years, more water has been pumped out each year than is replaced by rainfall. What is the MOST LIKELY long-term consequence of this pattern?

Accepted Answer

The aquifer will eventually be depleted, causing a serious freshwater shortage for the city

Question 4

Only about 3% of Earth's water is freshwater, and most of that is frozen in glaciers and ice caps. Which statement BEST analyzes what this means for human water use?

Accepted Answer

The small amount of accessible freshwater makes careful management critical, since it must support all human, animal, and plant needs on land

Question 5

Two neighboring farms grow the same crop. Farm 1 uses flood irrigation, flooding entire fields with water. Farm 2 uses drip irrigation, delivering water directly to plant roots. Farm 2 produces the same crop yield using 50% less water. What does this comparison BEST demonstrate?

Accepted Answer

Changing irrigation methods can significantly reduce water use without reducing food production, helping address water scarcity

Question 6

A student argues: 'Water scarcity is only a problem in hot, dry desert regions.' Which piece of evidence BEST disproves this claim?

Accepted Answer

Cities like Cape Town, South Africa, and Chennai, India — which have moderate climates — have experienced severe water shortages due to overuse and drought

Question 7

A forest is cut down near a river to build a neighborhood. After the deforestation, scientists measure that the river's water level drops during dry seasons and floods more during rainstorms. Which explanation BEST accounts for BOTH observations?

Accepted Answer

Without tree roots to absorb and slowly release rainwater into the ground, rain runs off quickly causing floods, while less water is stored underground to feed the river during dry periods

Question 8

Scientists predict that climate change will make wet regions wetter and dry regions drier. If this prediction is correct, which group faces the GREATEST increase in water scarcity risk?

Accepted Answer

Farming communities in already semi-arid regions that depend on seasonal rainfall for crops and drinking water

Question 9

A school tracks its monthly water use and finds that 40% is used for toilets, 30% for sinks, 20% for irrigation of the school garden, and 10% for the cafeteria. The school wants to reduce total water use by 25%. Which strategy, based on this data, would MOST effectively reach that goal?

Accepted Answer

Install water-saving toilets and low-flow faucets, since toilets and sinks together account for 70% of water use

Question 10

In some regions, people collect and treat rainwater for drinking. Critics argue this is unsafe, while supporters argue it reduces pressure on freshwater supplies. Which statement BEST analyzes the trade-offs of widespread rainwater harvesting?

Accepted Answer

Rainwater harvesting can reduce demand on freshwater sources and help communities during droughts, but requires proper collection and treatment systems to be safe and effective

Quiz on Water Scarcity

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